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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 6 |
| 3 | 36 |
| 4 | 547 |
| 5 | 26672 |
| 6 | 5120069 |
| 7 | 4581266029 |
| 8 | 21912279450653 |
| 9 | 627026135401140277 |
| 10 | 118043015040470215561725 |
| 11 | 158758107128989643461422723149 |
| 12 | 1641097327889006717487651007699748392 |
[1,2,6,36,547,26672,5120069,4581266029, 21912279450653,627026135401140277, 118043015040470215561725, 158758107128989643461422723149, 1641097327889006717487651007699748392] |